FROM alpine:3.15

RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.ustc.edu.cn/g' /etc/apk/repositories  \
    && apk add postfix postfix-pgsql \
    && postconf -e "maillog_file = /dev/stdout" \
    && rm -rf /var/cache/apk/*

EXPOSE 25 465

CMD ["/usr/sbin/postfix", "start-fg"]